Coming back after not playing/ maintaining muscles in embouchure
That's a good bit of downtime before an important event. However, if you take a mouthpiece with you, and if you can get some private time away from people who won't be offended by wierd noises, you can do some buzzing exercises every day to maintain you conditioning. Also, you have two weeks between your return and the camp; in my experience, that much time, with daily playing, should bring you back pretty close to what you were.
Caveat -- I am not a pro, and my experience is limited. The pros might have some better advice.
David Bjornstad
1923 Conn New Wonder 86I, Bach 6 1/2 AL
2018 Wessex EP100 Dolce, Denis Wick 4ABL
2013 Jinbao JBEP-1111L, Denis Wick 4AM
2015 Jinbao JBBR-1240, Denis Wick clone mouthpiece of unknown designation
Cullman (AL) Community Band (Euph Section Leader)
Brass Band of Huntsville (2nd Bari)